 By 1921, the whole length of future MD 30 was planned for improvement and the concrete road had been extended to the southern end of Hampstead; in addition, Main Street in Manchester had been paved in concrete.Main Street in Hampstead was rebuilt as a concrete street and the remainder of the highway to the Pennsylvania line, excluding Main Street in Manchester, was completed as a macadam road in 1923.MD 30 was one of the original state-numbered highways marked in 1927.